rt-thread/components/net/uip/doc/example-mainloop-with-arp.c

#include "uip.h"
#include "uip_arp.h"
#include "network-device.h"
#include "httpd.h"
#include "timer.h"

#define BUF ((struct uip_eth_hdr *)&uip_buf[0])

/*---------------------------------------------------------------------------*/
int
main(void)
{
  int i;
  uip_ipaddr_t ipaddr;
  struct timer periodic_timer, arp_timer;
  
  timer_set(&periodic_timer, CLOCK_SECOND / 2);
  timer_set(&arp_timer, CLOCK_SECOND * 10);
  
  network_device_init();
  uip_init();

  uip_ipaddr(ipaddr, 192,168,0,2);
  uip_sethostaddr(ipaddr);

  httpd_init();
  
  while(1) {
    uip_len = network_device_read();
    if(uip_len > 0) {
      if(BUF->type == htons(UIP_ETHTYPE_IP)) {
	uip_arp_ipin();
	uip_input();
	/* If the above function invocation resulted in data that
	   should be sent out on the network, the global variable
	   uip_len is set to a value > 0. */
	if(uip_len > 0) {
	  uip_arp_out();
	  network_device_send();
	}
      } else if(BUF->type == htons(UIP_ETHTYPE_ARP)) {
	uip_arp_arpin();
	/* If the above function invocation resulted in data that
	   should be sent out on the network, the global variable
	   uip_len is set to a value > 0. */
	if(uip_len > 0) {
	  network_device_send();
	}
      }

    } else if(timer_expired(&periodic_timer)) {
      timer_reset(&periodic_timer);
      for(i = 0; i < UIP_CONNS; i++) {
	uip_periodic(i);
	/* If the above function invocation resulted in data that
	   should be sent out on the network, the global variable
	   uip_len is set to a value > 0. */
	if(uip_len > 0) {
	  uip_arp_out();
	  network_device_send();
	}
      }

#if UIP_UDP
      for(i = 0; i < UIP_UDP_CONNS; i++) {
	uip_udp_periodic(i);
	/* If the above function invocation resulted in data that
	   should be sent out on the network, the global variable
	   uip_len is set to a value > 0. */
	if(uip_len > 0) {
	  uip_arp_out();
	  network_device_send();
	}
      }
#endif /* UIP_UDP */
      
      /* Call the ARP timer function every 10 seconds. */
      if(timer_expired(&arp_timer)) {
	timer_reset(&arp_timer);
	uip_arp_timer();
      }
    }
  }
  return 0;
}
/*---------------------------------------------------------------------------*/